2018-10-27 15:17:05,819 WARN  [o.a.c.e.o.NetworkOrchestrator] (Network-Scavenger-1:ctx-db281a94) (logid:2d18453c) Caught exception while running network gc:
com.cloud.utils.exception.CloudRuntimeException: Caught: com.mysql.jdbc.JDBC4PreparedStatement@64b5357b: SELECT networks.id FROM networks  INNER JOIN network_offerings ON networks.network_offering_id=network_offerings.id  INNER JOIN op_networks ON networks.id=op_networks.id WHERE networks.removed IS NULL  AND  (op_networks.nics_count = ** NOT SPECIFIED **  AND op_networks.gc = ** NOT SPECIFIED **  AND op_networks.check_for_gc = ** NOT SPECIFIED ** )
        at com.cloud.utils.db.GenericDaoBase.customSearchIncludingRemoved(GenericDaoBase.java:507)
        at com.cloud.utils.db.GenericDaoBase.customSearch(GenericDaoBase.java:518)
        at com.cloud.network.dao.NetworkDaoImpl.findNetworksToGarbageCollect(NetworkDaoImpl.java:461)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:338)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:197)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
        at com.cloud.utils.db.TransactionContextInterceptor.invoke(TransactionContextInterceptor.java:34)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:174)
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
        at com.sun.proxy.$Proxy64.findNetworksToGarbageCollect(Unknown Source)
        at org.apache.cloudstack.engine.orchestration.NetworkOrchestrator$NetworkGarbageCollector.reallyRun(NetworkOrchestrator.java:2761)
        at org.apache.cloudstack.engine.orchestration.NetworkOrchestrator$NetworkGarbageCollector.runInContext(NetworkOrchestrator.java:2745)

Mgmt server, network/db

master/4.12